Examine source code of Attention training

{
  "manifest_version": 3,
  "name": "Attention training",
  "version": "0.7",
  "description": "Helps you remain focused on a topic of study for extended periods.",
  "permissions": [
    "alarms",
    "storage",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "blocklists/*"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "action": {
    "default_popup": "scripts/popup.html"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "run_at": "document_end",
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{67ffb104-ecb2-46ae-953b-8d503d0f471f}",
      "strict_min_version": "109.0"
    }
  }
}